LRUEnterpriseContextCachePolicy.ResizerTask
This TimerTask resizes the cache capacity using the cache miss frequency
algorithm, that is the more cache misses we have, the more the cache size
is enlarged, and viceversa.

importXml

Reads from the configuration the parameters for this cache policy, that are
all optionals.
FIXME 20010626 marcf:
Simone seriously arent' all the options overkill? give it another 6 month .
Remember you are exposing the guts of this to the end user, also provide defaults
so that if an entry is not specified you can still work and it looks _much_ better in
the configuration files.

flush

public void flush()

Flush is overriden here because in this policy impl
flush might not actually remove all the instances from the cache.
Those instances that are in use (associated with a transaction) should not
be removed from the cache. So, the iteration is done not until the cache is empty
but until we tried to age-out every instance in the cache.